1227749 EEPROM Type

[Ward]

This the reason the ECM p/n is not the key item and more that the p/n of you
PC will describe what you have installed in the way of software of firmware.

Ward

On Thu, 2 Dec 1999 20:28:48 -0800, gmecm at efi332.eng.ohio-state.edu wrote:

>  Hi Scott,
>  
>  You might be thinking that just because it's a 749, that the layouts for
the
>  data on all cars using the 749 would be the same. No. The Syclone and
>  Sunbird Turbo are the same, but the Quad 4 is totally different.
>  
>  Also, the Syclone use a 16k byte eprom (27128), whereas the Quad 4 uses a
>  32k byte eprom (27256).
>  
>  So things vary a lot on applications using the same ECM.
>  
>  Terry
>  
>  ----- Original Message -----
>  From: Scott Flanagan <flanaj at mindspring.com>
>  To: <gmecm at efi332.eng.ohio-state.edu>
>  Sent: Thursday, December 02, 1999 8:00 PM
>  Subject: 1227749 EEPROM Type
>  
>  
>  > While at the junkyard the other day I luckily came accross two '88
>  Pointiac
>  > Grand Am Quad 4's.  They have the 1227749 with the uncommon Integrated
>  > Direct Ignition.  I am trying to work with an old reader, but I am not
too
>  > sure what type of chip it is, or if it is too odd to read.  The chip in
>  one
>  > of the ECU's has the number 27C256 on it, that is an original chip,
which
>  > does not have a window for erasing.  My reader says it can read an
I27256
>  > but it can't read it at all.  The other ECU is a remanufactured one,
the
>  > chip does not have any numbers on it that are useful, but it does have
a
>  > window for erasing things, my burner can read it but the information is
>  > garbled.  When loaded into Promgrammer it has some wacky values such as
0
>  > cylinders, etc.  Also, this is probably a dumb question but do you have
to
>  > unsolder the chip from the long brown carrier?  Right now I have an
>  adapter
>  > that I made that connects the brown carrier to the reader.  Thanks, I
am
>  > very excited that I could finally find these ECU's and complete
harnesses.
>  >
>  >
>  >                             -Scott Flanagan
>  >
>  >
>  > '80 Fiat Spider (Awaiting new FI and Turbo)
>  >
>  >
>  





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